ASTM_D_1389_-_07.pdf

Designation:D 1389 07An American National StandardStandard Test Method forProof-Voltage Testing of Thin Solid Electrical InsulatingMaterials1This standard is issued under the fixed designation D 1389;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers a general procedure for proof-voltage testing of thin solid electrical insulating materials atcommercial power frequencies.It is intended to apply princi-pally to flat materials but is applicable,with modification,toany form that permits continuously passing the materialbetween suitable electrodes.2,31.2 On extremely thin materials(usually less than 0.05 mm(0.002 in.),the test results may be influenced more bymechanical damage caused by conditions of test than bydielectric defects.Consequently,this test method is not recom-mended for use with extremely thin materials,unless priordetermination has established that the test results are notinfluenced by mechanical damage.1.3 While the equipment and procedures described in thistest method relate specifically to tests made with powerfrequency ac voltages,similar equipment and procedures areused for proof-voltage tests using dc voltages.To the extentthat it applies to dc tests,this test method can serve as a guidefor persons making such tests.However,only tests made withpower frequency ac voltages can be said to be in accordancewith this test method.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 7.2.Referenced Documents2.1 ASTM Standards:4D 149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 1711 Terminology Relating to Electrical Insulation3.Terminology3.1 Definitions:For other definitions relating to electricalinsulating materials,refer to Terminology D 1711.3.1.1 proof voltage test,na procedure during which aspecified voltage is applied for a specified time betweenelectrodes separated by a specimen located between the elec-trodes to determine whether or not a specific current isexceeded at that voltage.3.1.1.1 DiscussionIf fixed electrodes are used,the voltageis held for a specified time.If a large area(for example,a rollcontaining sheet or film material)is being tested using roller,brush,or blade electrodes,a velocity of material travel must bespecified.4.Summary of Test Method4.1 In this test method,sheet insulating material is passed ata specified speed between roller electrodes with a specified acvoltage applied,so that all,or nearly all,of the area of thematerial is subjected to the specified voltage.The number ofelectrical breakdowns and their locations are determined.4.2 The applied proof voltage may be selected as a percent-age of the dielectric breakdown voltage,as determined inaccordance with Test Method D 149,or as a multiple of thebreakdown voltage for an air gap of equal thickness.4.3 Unless the material being tested is known to have highresistance to partial discharges,the proof voltage is ordinarilyselected to be below the visible corona level.If it is necessaryto test at a voltage at which visible corona will be present,the1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.12 on Electrical Tests.Current edition approved May 1,2007.Published June 2007.Originallyapproved in 1956.Last previous edition approved in 2006 as D 1389 06.2Bartnikas,R.,Chapter 3,“High Voltage Measurements,”Electrical Propertiesof Solid Insulating Materials,Measurement Techniques,Vol.IIB,EngineeringDielectrics,R.Bartnikas,Editor,ASTM STP 926,ASTM,Philadelphia,1987.3Nelson,J.K.,Chapter 5,“Dielectric Breakdown of Solids,”ElectricalProperties of Solid Insulating Materials:Molecular Structure and ElectricalBehavior,Vol.IIA,Engineering Dielectrics,R.Bartnikas and R.M.Eichorn,Editors,ASTM STP 783,ASTM,Philadelphia,1983.4For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Copyright ASTM International Provided by IHS under license with ASTM Licensee=University of Texas Revised Sub Account/5620001114 Not for Resale,12/04/2007 17:23:03